دورية أكاديمية
أعرض في EDS

Rapid Sediment Accumulation Results in High Methane Effluxes from Coastal Sediments.

التفاصيل البيبلوغرافية
العنوان: Rapid Sediment Accumulation Results in High Methane Effluxes from Coastal Sediments.
المؤلفون: Matthias Egger, Wytze Lenstra, Dirk Jong, Filip J R Meysman, Célia J Sapart, Carina van der Veen, Thomas Röckmann, Santiago Gonzalez, Caroline P Slomp
المصدر: PLoS ONE, Vol 11, Iss 8, p e0161609 (2016)
بيانات النشر: Public Library of Science (PLoS), 2016.
سنة النشر: 2016
المجموعة: LCC:Medicine
LCC:Science
مصطلحات موضوعية: Medicine, Science
الوصف: Globally, the methane (CH4) efflux from the ocean to the atmosphere is small, despite high rates of CH4 production in continental shelf and slope environments. This low efflux results from the biological removal of CH4 through anaerobic oxidation with sulfate in marine sediments. In some settings, however, pore water CH4 is found throughout the sulfate-bearing zone, indicating an apparently inefficient oxidation barrier for CH4. Here we demonstrate that rapid sediment accumulation can explain this limited capacity for CH4 removal in coastal sediments. In a saline coastal reservoir (Lake Grevelingen, The Netherlands), we observed high diffusive CH4 effluxes from the sediment into the overlying water column (0.2-0.8 mol m-2 yr-1) during multiple years. Linear pore water CH4 profiles and the absence of an isotopic enrichment commonly associated with CH4 oxidation in a zone with high rates of sulfate reduction (50-170 nmol cm-3 d-1) both suggest that CH4 is bypassing the zone of sulfate reduction. We propose that the rapid sediment accumulation at this site (~ 13 cm yr-1) reduces the residence time of the CH4 oxidizing microorganisms in the sulfate/methane transition zone (< 5 years), thus making it difficult for these slow growing methanotrophic communities to build-up sufficient biomass to efficiently remove pore water CH4. In addition, our results indicate that the high input of organic matter (~ 91 mol C m-2 yr-1) allows for the co-occurrence of different dissimilatory respiration processes, such as (acetotrophic) methanogenesis and sulfate reduction in the surface sediments by providing abundant substrate. We conclude that anthropogenic eutrophication and rapid sediment accumulation likely increase the release of CH4 from coastal sediments.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1932-6203
Relation: http://europepmc.org/articles/PMC4999275?pdf=render; https://doaj.org/toc/1932-6203
DOI: 10.1371/journal.pone.0161609
URL الوصول: https://doaj.org/article/3860e42d7c4b4111813ec69b484a2007
رقم الأكسشن: edsdoj.3860e42d7c4b4111813ec69b484a2007
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:19326203
DOI:10.1371/journal.pone.0161609